knx
http://backports.ubuntuforums.org
$ apt-cache search freenx
$ sudo nxserver --adduser gerardvw
NX> 100 NXSERVER - Version 1.4.0-45-SVN OS (GPL)
NX> 1000 NXNODE - Version 1.4.0-45-SVN OS (GPL)
NX> 716 Public key added to: /home/gerardvw/.ssh/authorized_keys2
NX> 1001 Bye.
NX> 999 Bye


$ sudo echo "deb http://kanotix.com/files/debian/ ./" > /etc/apt/sources.list
$ sudo apt-get install freenx

http://www.ubuntuforums.org/showthread.php?t=1968